Assigitob to steel



W. STEPHENS.

METHOD OF MAKING, RESHAPING, AND SHARPENING AUGER DRILLS. APPLICATION FILED MAR. 15, 1920.

1,403,652, Patented Jan. 17, 1922.

3 SHEETSSHEET l.

@WUWM William 5TEPhEn5 W M 6% W. STEPHENS. METHOD OF MAKING, RESHAPING, AND SHARPENING AUGER DRILLS. APPLICATION FILED MAR-151N920.

1 403 652 Patented Jan. 17, 1922.

3 SHEETS-SHEET 2- W, I 45 wmym]:

William fifephens W. STEPHENS.

METHOD OF MAKING, RESHAPING, AND SHARPENING AUGER DRILLSL APPLICATION HLED MAR. 15. 1920.

1,403,652, Patented Jan. 17, 1922.

3 SHEETS-SHEET 3- William flie nhens EVILLIAML STEPHENS, 03$ IRONWGOIJ, MICHIGAN, Afifill'fihltlli; T Ei'lililldlfr ft; TU. GOMBANY O1? AMERICA, 01? MILWVi-lrlllillillll, 'WlTliiGtlNflEll.

METHOD OF MAKING, RESHAPING, AND SHIARIPENING DBILIJS.

Specification. of. Letters Patent.

Patented Jan. 1?, it 23 in.

Application fiIed March 15, 1920. Serial Ito. 366,023.

To all whom it may concern:

Be it known that I, WVILLIAM SrnPHENs, a citizen of the United States, and resident oflronwood in the county of Gogebic and State of Michigan, have invented certain. new and useful Improvements in Methods of Making, Reshaping, and Sharpening Auger Drills; and I do hereby declare that the following is a full clear, and enact description thereof.

My invention relates to new and useful improvements in the method of making, re-

shaping; and sharpening auger drills.

It is a comparatively simple matter to malre and sharpen by mechanical means all these types of drills used in mining operations with the enceptionof the auger twist drill, this form of drill being used in soft rock, iron ore, coal etc. Consequently heretofore auger drills have been made practiially entirely by hand and have also been re shaped and resharpened in the same manner.

It is therefore the primary object of this invention to carry out by means of machinery those operations used in the making of auger drills which were formerly per formed by hand. The outcome of this in vention is that auger drills may be made, re shaped and sharpened at a rate approximately 300% faster than heretofore, and the workmanship is much more accurate and uniform,.and the drills are altogether more satisfactory and efficient in operation than the hand made articles.

It is an. additional object of the invention to provide a means for carrying out the in vention through a series of die forming oporations.

With these general objects in view the invention. resides in the novel features of construction, combination. and arrangement of parts which will be hereinafter more particularly described and claimed.

In the accompanying drawings:

Figures 1. to 8 illustrate the major opera tions in the formation of a piece of twist drill. stock into a finished auger drill, the same operations. however, being utilizedin the reshaping of a worn or dull twist auger drill.

Figure 9 is a perspective view of one of the forming dies used in this invention.

the forms of dolly used in sharpeninc' the drill, and a Figure 12 is a plan. view of one of the gripping dies which holds the drill. during" the sharpening operation. L

As herebefore mentioned the macl'rinery with which the foregoing briefly described dies and dolly are used may be the ordinary forms of drill sharpener-s. However, as such maclnnes vary somewhat in mechanical con struction, it is to be understood that it is within the scope of this invention to construct the several dies and dollies to accommodate them for use in connection with any particular machine. Furthermore although I have illustrated the formation of an an i-eidrill from a piece of twist drill stock, hi1. old and worn out auger drill may be reshaped and resharpened by the same method. and with exactly the same series of opera-- tions. 7

Likewise various changes may be nurde in the arrangements of the several parts of the forming dies and in the sharpening head of the dolly, without departing; from or sacrificing any of the priciples of the invention.

Referring more particularly to the accornpanyinp; drawings, it will be noticed that the forming; die 1, which is adapted to eteoperate with a second forming die 2, has a slot 3 formed in one side for the purpose of receiving one end of a piece of twist (flrill. stock S, or the bit end of an auger drill, to permit the twisted portion. of the same to be straightened or untwisted. ()rdinarily the die 1 is the lower die and has its upper face arranged to die form the stock or drill when the lower face of the other or upper die 2 is moved theretoward.

This face of the lower die It has a side fuller 4]: with which the side fuller 5 of the upper die 2 co-operates a Ha .zener 6, the upper die 2 having a similar portion 7, hi h o f these flatteners being disposed adjacent one side of the dies, the opposite side portion of each having a substantially semicylindrical recess As shown in liigureb the recesses 8 are adapted to receive a per-- tion of the twist part of the stoclr or drill when the flatteners are in operation. The i.

side fullers 1- and 5 project above the planes of the major surfaces of the faces of the dies 1 and 2 and are arranged at the side edges thereof adjacent the recesses 8.

At the opposite end of the dies "s positioned a cutter used for pointing the end of the stock or drill. In the die 1 one corner 1S cut away as at 9 to provide a ll-shaped shoulder 10, the faces of which correspond to the desired shape of the pointed-end of the drill. The other die 2 at a corresponding corner thereof has a boss 11 extending above the plane of the major surface of its face, one side of which boss has a V-shaped shoulder 12 for co-operation with the shoulder 10 of the die 1. Obviously when a drill or piece of stock is laid upon the surface of the die 1 with a portion thereof projecting beyond the shoulder 10, such portion will be cut 03 when the upper die is brought into co-operation with the lower. As in the case of the flatteners 6 and 7 the faces of the dies 1 and 2 are recessed as 13 to receive the twisted portion of a piece of drill stock or any auger drill when the cutter is in operation. 7

Located between the fiattener portions of the dies and the cutter thereof, is a for bringing the drill to a final predetermined size and shape. This gage includes, in each die, a slot 14, the outer end of which opens through the wall of its respective die, while the inner end communicates with a substantially semi-cylindrical recess 15. The slots 14, when the dies are in co-operation, as in Figure 8, receive the bit end portion of the partially completed auger drill, whereas the recesses 15 receive the twist part thereof adj acent said bit end. Thus the bit end is held in longitudinal alinement with the axis of the twisted portion of the drill.

The dolly illustrated in Figure 11 is used in upsettin and sharpening the bit end of an auger drill and consists of a block 16 having its head end tapered as at 17, the face 18 of this end having a sharpening recess 19. This recess is adapted to bevel the opposite edges of the faces of the pointed end of the drill so as to form efficient drilling faces. In a right hand drill the faces are beveled in an opposite direction from the faces of a left hand drill. Consequently when a right hand drill is being constructed one type of dolly is used, while when a left hand drill is being sharpened, a dolly having a different shaped recess 19 is used.

During the sharpening operation the drill is held by a pair of gripping dies 20, each of which has a longitudinally extending substantially semi-cylindrical recess 21, one end of which communicates with a bit end receiving slot 22, the opposite side walls of which are flared outwardly as at 23. As shown in Figure 7, the recesses 21 receive the twisted portion of a drill and tightly grip the same while a dolly acts upon and sharpens the bit end, the contact of the former with the latter increasing the thickness of the bit end in view of the flared walls-23.

In use, the dies 1 and 2 are placed in a suitable machine so that one of them is relatively stationary and the other is movable toward and away from the same. The gripping dies are similarly positioned with respect to each other, whereas the dolly is reciprocable toward and away from the dies 20. The method of coi'istructing a complete auger drill by means of the several elements illustrated in Figures 9 to 12 is more or less graphically depicted in Figures 1 to 8.

Specifically the several steps which form my improved method are substantially as follows: The stock S (or a worn auger drill) has one end inserted in the slot 3, after about three inches of this end has been heated to a predetermined degree, and then the same is untwisted to provide a straight portion 25 on which to form a bit end. Upon removal of the end of the stock from the slot 3, the same is placed between the side fullers d and 5 of the dies 1 and and as the same come together the bit end portion is widened as at 26 (see Figure 3) without lengthening the same.

The third step in the operation is to bring this widened end 26 to a uniform thickness preparatory to being cut, and this is acconn plished by means of the flatteners 6 and 7, the position of the stock on the flattener 6 being shown in Figure 5.

is the dies 1 and 2 are brought together when the stock is between the flattcners 6 and 7, the bit end portion is alined with the twisted portion inasmuch as that portion of the latter adjacent the bit end portion is positioned within the recesses 8. \Vith the dies 1 and 2 spaced apart, the stool: is moved to the opposite side thereof, and the bit end portion disposed over the shoulder 10 of the cutter so that when the dies are next brought into operation, the shoulder 12 will cut ofl the surplus metal of the bit end por tion and give it a V-shape. Inasmuch as it is desirable that the point of the V be in the longitudinal axis of the drill. the twisted portion of the stock adjacent the bit end is located in recesses 13 thus aligning the axis of the stock with the center of the cutter. (See Figure 6.)

During the next operation the dies 1 and 2 are dispensed with and the partially completed drill is gripped between the dies 20 as shown in Figure 7, and while so gripped a dolly is forcibly brought into engagement with the Vshaped end which has been formed by the cutter. The faces of this end are thereby beveled in opposite directions as shown at 27 in the last mentioned figure. The dolly also has the function of transversely increasing the thickness of the bit end inwardly of these cutting faces, this being permitted. by he flared outer end of the slots 22 of the gripping dies 20.

The bevel of the faces of the V-shaped panacea end of the drill. corresponds to the twist of the latter so that when a left hand drill is being sharpened one type of dolly is used and when a right hand drill is being like wise treated a different form of dolly is used as hereinbefore mentioned. Owing to the construction of the gripping dies as shown in Figure 7 drills having a variation in diameter of a quarter of an inch may be gripped and sharpened.

After the drill has been upset and sharpened by the dolly, it is desirable to gage the same so as to bring it to a final predetermined size and shape, and this is accomplished through further use of the dies 1 and 2, and especially the gage portion including the slots 14: and semi-eylindrieal recesses 15. In other words the bit end of the nearly completed drill is inserted in one of the slots 14:, the portion of the twisted part of the drill immediately adjacent the bit end being in the recess 15 which communicates with the adjacent slot. Then as the other die is moved toward the die into which the drill has been placed, the bit end will be gripped and shaped. After thus gaging the drill it is again subjected to the action of the dolly as in the operation just referred to. The final action consists in reinserting the bit end in the slot 3 and slightly twisting the drill so as to extend the twist close to the bit end.

Inasmuch as there are several very necessary steps in the formation or reshaping of an anger drill, it is obvious that the carrying out of these steps by machine greatly de creases the cost of manufacture and iiicreases production over the usual methods. The primary object of this invention is thus readily accomplished.

I claim:

1. The herein described method of ma chanically making, reshaping and sharpening auger drills which consists in first untwisting one end of a twist drill or twist drill stock to form a bit end portion, together with the following die forming op erations; transversely widening the bit end portion, pointing the bit end portion after widening the same, and then forming drilling faces on the pointed end.

2. The herein. described method of me chanically making, reshaping and sharpening auger drills which consists in first un twisting one end of a twist drill or twist drill stock to form a bit end portion, together with the following die forming op erations; transversly widening the bit end portion, pointing the bit end portion after widening the same, then forming drilling faces on the pointed end, and thereafter gaging the bit end portion to bring it to a predetermined size and shape.

3. The herein described method of making, reshaping and sharpening auger drills which consists in straightening the bit end portion of a twist drill or twist drill stock to remove the twist, widening the straightened portion, flattening the straightened widened portion to aline it with thetwisted portion, pointing the straightened widened portion, forming drilling faces on the pointed end of the straightened widened portion, and thereafter gaging the bit end portion to shape it to a predetermined size.

4. The herein described method of making, reshaping and sharpening auger drills which consists in untwisting one end of a twist drill or twist drill stock to form a bit end portion, transversely widening the bit end portion, flattening the bit end portion and alining it with the twist portion, cutting off the end of the widened flattened portion to provide a point, providing drilling faces on the point, gaging the bit end portion to bring it to a predetermined size and shape, thereafter reforming the drilling faces on the point.

In testimony that I claim the foregoing I have hereunto set my hand at Ironwood, in the county of Gogebic and State of Michigan.

WILLIAM STEPHENS. 

